3-D DC resistivity modeling and inversion using multi-resolution framework

Document identifier: oai:DiVA.org:ltu-77215
Access full text here:10.1080/22020586.2019.12073116
Keyword: Natural Sciences, Earth and Related Environmental Sciences, Geophysics, Naturvetenskap, Geovetenskap och miljövetenskap, Geofysik, Direct Current Resistivity method, Multi-resolution grid, Modeling, Inversion, Prospekteringsgeofysik, Exploration Geophysics
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):
SDG 7 Affordable and clean energy
The SDG label(s) above have been assigned by OSDG.ai

Abstract:

We discuss the implementation of multi-resolution framework to 3-D Direct Current (DC) problem. Commonly used staggered (SG) grid fixes the horizontal grid resolution for all depths. Thus, employing the fine horizontal resolution may lead to an over-discretised forward problem, subsequently affecting the performance of the inversion. We implemented a novel multi-resolution (MR) grid approach to the 3-D DC modeling and inversion problem, which allows adjustment of the horizontal resolution with depth. By using finer resolution for the near-surface regions, MR grid can ensure the modeling accuracy and describe the shallow features in the inversion model as well. The ability to use relatively coarser horizontal resolution for the deeper regions reduces the computation costs compare to the SG grid modeling. As a result, modeling and inversion can be accelerated several times by solving a smaller problem. Our grid resembles non-conformal rectangular grid, which commonly used in finite-elements modelling.

Authors

Jingyu Gao

Luleå tekniska universitet; Geovetenskap och miljöteknik
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Maxim Smirnov

Luleå tekniska universitet; Geovetenskap och miljöteknik
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Maria Smirnova

University of Cologne, Köln, Germany
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Gary Egbert

Oregon State University, Corvallis, US
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